생균제의 급여가 산란계의 생산성과 장내 미생물의 변화에 미치는 영향

Effect of Feeding Probiotics on Performance and Intestinal Microflora of Laying Hens

The objects of this experiment was to investigate the effect of dietary several supplemental probiotics on performance and intestinal microflora of Lohmann brown laying hens from 68 to 80 weeks. Basal diets based on corn and soybean meal contained 18.0% CP and 2,720㎉/kg ME. Bacillus subtilis, Lactobacillus salvarius isolated from piglet(LSP) were fed at the level of 0.1 and 0.2% in a one way design. There were four replicates of 40 hens each per treatment. Egg production, feed intake, feed conversion ratio(FCR), eggshell quality were measured at every four weeks and intestinal microflora were examined at the end of experiment. Egg production of bird fed 0.2% individual probiotics was significantly higher than that of control(P 0.05). Birds fed the diet containing 0.2% LSC and LSP had significantly lower FCR than other treatments(P 0.05). However, egg weight of birds fed control and 0.2% BS diet showed higher than other treatments. Feed intake of 0.2% BS and 0.1% LSP treatment was significantly higher than other treatments, but was not consistency of all treatments(P 0.05). Eggshell breaking strength and thickness of hens fed probiotics tended to increase compared to that of control, but was not significantly different. Intestinal anaerobes, Lactobacillus spp. and yeast of hens fed all tested probiotics were significantly increased compared to those of control. The number of intestinal E. coli of all probiotics treatments except 0.1% LSP tended to decrease. Intestinal Lactobacillus spp. was increased significantly by 0.1% dietary LSC, whereas intestinal yeast showed significant increase in LSP treatments(P〈0.05). The results of this experiment indicated that feeding probiotics to laying hens improved the egg production, FCR and increased beneficial microflora.